Projection apparatus



June 10, 1930. H. H. STRONG 1,762,801

PROJECTION APPARATUS Filed May 14, 1927 5 Sheets-Sheet 1 Herr- 5 StrorigHagen-toy; 3

A-ttornege June 10, 1930. H STRONG I 1,762,801

PROJECTION APPARATUS Filed May 14, 1927 5 Sheets-Sheet 2 Hart-g H.strong 7 Inve rrto r Attorneys June 10, 1930. H. H. STRONG 1,762,801

PROJECT ION APPARATUS Filed May 14, 1927 5 Sheets-Sheet 3Ill]III]!Ill1Illlllllllllllllllllllllllll;

8 HOI'ItS H. Strong Pt I Attornegs June 10, 1930. H. H. STRONGPROJECTION APPARATUS Filed May 14,. 1927 s Sheets-Sheet 4 H Stro n3Inventor Attorneris J n? 1930- j, H. H. STRONG 0 PROJECTION APPARATUSFiled May 14, 1927 5 Sheets-Sheet 5 Harrg Strong Attorneys Patented June10, 1930 UNITED, STATES PATENT orrlcs HARRY n. STRONG, 0F TOLEDO, 01110,ASSIGNOR'TO THE STRONG ELECTRIC conrona TION, OF WILMINGTON, DELAWARE, ACORPORATION OF DELAWARE PROJECTION APPARATUS Application filed May 14,1927. Serial No. 191,363.

My invention relates to projection apparatus, and particularly to lampsfor projecting both motion picture and stereopticon slides, and theprincipal object of my inven: tion is to provide a new and improved lampof this type. In the drawings accompanying this specification andforming a part of this application I have shown, for purposes ofillustration, one form which my invention may assume, and in thesedrawings:

Figure l is a front end elevation of the embodiment of my inventionillustrated herein showing the device in position for the projection ofmotion pictures,

Figure 2 is a View similar to Figure 1 showing the device in positionfor the .projection of stereoptican slides,

Figure 3-is a rear end elevation,

Figure 4 is a side elevation taken from the right in Figures 1 and 2,and from the left in Figure 3, 4

Figure 5 is a horizontal section taken 0 the line 5-5 of Figure 4,

Figure 6 is a section taken on the line 6-6 of Figure 4, showingparticularly the front carbon holder and the interior ofthe nose, andshowing the nose in motion picture projecting position,

Figure 7 is a View similar to Figure 6 but showing the nose instcreopticon projecting position,

Figure 8 is a. view similar to Figure 4 on'litting parts to show moreclearly the front carbon supporting and operating means, and the carbonoperating mechanism,

Figure 9 isa fragmentary sectionvon the line 99 of Figure 4 showing therear carbon support,

Figure 10 is a fragmentary section on the line 10-10 of Figure 9 showingthe connection between the rear carbon holder and the supporting f1 ametherefor,

Figure '11 is a View similar to Figure 4 omitting parts to show moreclearly the rear carbon operating and adj usting mechanism, andthecarbon operating mechanism,

Figure 12 is a detail showing the connection between the handandmotordrives for the carbon operating mechanism,

Figure 13 is a sectionon the line 13-13 showing the reflector andreflector support, Figure 14 is a section on the line 14'14 ofFigure'13, I

Figure 15 is a fragmentary view similar to Figure '4 omitting parts toshow more clearly the reflector support. and adjustment, showing thereflector in the position for motion picture projection,

Figure 16 is a fragmentary View similar to Figure 15 but showing theparts in the position for stereopticon projection, while Figure 17 is adetail showing the means for adjusting the throw of the reflectorbetween motion picture projecting' position' and stereopticon projectingposition.

The lamp'herein shown is enclosed in a housing 21 comprising front andrear end plates 22 and 23 provided with flanges 24 and 25 and united bysuitable tierods 26 and 27 a top 28-extending between the front and rearend plates 22 and 23 secured to the flanges 24 and 25 and furtheruniting the front and rear. end plates 22 and 23, side bases 29 alsoextending between the front and rear end plates 22 and 23 secured to theflanges 24 and 25 and further uniting the front and rear end plates 22and 23, doors 30 pivoted onthe tierods 27 and normally closing the spaceon the housing 21 between the lower edge of the top 28 and the upperedge of the-"corresponding side base 29, and a pair of carrier rods 31and 32 secured to thefront and rear end plates 22 and 23, additionallyuniting the front and rear end plates 22 and 23, and recipro cablysupporting a front carbon holderassem'bly 33, a rear carbon holderassembly 34, and a reflector assembly 35.

Pivoted to theend of the carrier rod 31 forwardly of the front end plate22 is a nose 36 over1ying the projection aperture 37 in the front endplate 22, provided with a motion picture projection aperture 38containing ailens 39 and adapted to be closed by means of a plate 40pivoted to the 'nose 36 at 41 and operable by means of a handle 42,provided also with a pair of apertures 43 for stereopticon projectioneach having alinecl therewith a suitable slide holder 44 and eachadapted to be closed by means of a plate 45 secured to a shaft' 46 iv-'the carrier rod 31, and by means of a suits I able handle 49, betweenthe position shown in Figure 1 wherein the motion picture roject'ingaperture 38 isalined with the ont end late aperture 37 and the positionshown in. igure 2 wherein the stereopticon pro- 'ecting apertures 43 arealined with the ont end plate aperture 37. V

The front carbon holder assembly 33 comprises a base provided at oneside with an ear 51 encircling the carried rod 32, and at the other'side with a fork 52 embracing the carrier rod 31, and carries securedthere-. to by suitable machine screws 53 a plate 54 from which rises acarbon supporting post 55 provided with a recess 56 in which the frontcarbon 57 is held firmly clamped in .position by means of a strap 58secured intermediate its end by means of a maehine screw. 59 to thecarbon supporting post 55 and acting to clamp the carbon 57 by movementof its upper end 60 toward the carbon supporting post 55 and the carbon57 as its lower end 6lfiis forced away from the carbon supporting post55 by the action of the tip 62 of a pin 63 screw-threadedly en gagingwithin a cooperatingly screwthreaded tube 64 carried by the plate 54,positioned with its tip 62 bearing against the lower end 61 of the strap58, and operated by means of a conveniently positioned handle 171.

' The rear carbon holder assembly 34 comprises a substantially squareframe 65 provided at one lower corner with an ear 66 encircling thecarrier rod 32, and at the other lower corner with a fork 67 embracingthe carrier rod 31, provided intermediate its lower side 68 with adownwardly depending lug 69, and intermediate its upper side 70 with asegmental spherical recess 71 receiving and supporting for universalmovement a cooperating segmental sphere 72 seated within the segmentalspherical recess 71 and provided centrally with an aperture 73 in whichis mounted an insulating sleeve 74 surrounding a rear carbon holder base75 carrying projecting from the forward end thereof carbon grippingfingers 76 and 77 effective to support between them the rear carbon 78.

. The segmental sphere72 is held in position seated in the segmentalspherical recess 71, and the segmental sphere 72 and rear carbon 78 areangularly adjusted relative to the frame 65 to aline the rear carbon: 78with the front carbon 57, by two separate and independent adjustingmeans operating together to secure the segmental sphere 72 asubstantially horizontal axis, and the two therefore operating toprovide a universal adjustment of-the'rea'r carbon 78 to permit movementof the rear carbon 78 in any direction.

The mechanism for adjusting the-carbon holding segmental sphere 72 aboutthe substantially vertical axis comprises an arm 79 extending laterallyfrom the segmental sphere 72, a tension spring 80 extending between theend of the arm 79 and the adjacent upper corner 81 of the fraine 65, anarm 82 extending laterally from the segmental sphere 72 in the oppositedirection from the arm 79 and provided at its end with a slot 83, andan; adjusting rod 84 provided at its end with a section 85screw-threaded to cooperate with a correspondingly screw- .threadedaperture 86 in thevupper corner 87 of the'frame 65, provided with areduced section 88 received Within the slot 83 in the arm 82,reciprocable through a suitable aperture' in the rear end plate 23 topermit reciprocation of the rear carbon holder assembly 34 along thecarrier rods 31 and 32, provided at its rear end with an operatinghandle 89, and effective to draw the arm 82 toward the frame 65 againstthe action of the tension spring 80 until the rear carbon 78 has assumedthe desired lateral position;

while the mechanism for adjusting the segmental sphere 72 about thesubstantiallyhorizontal axis comprises an arm 90 extending upwardly fromthe segmentalsphere 72, an arm 91 extending upwardly from the upper side70 of the frame 65, a tension spring 92 extending between the arm 90 andthe arm 91,

an arm 93 extending downwardly from thesegmental sphere 72 and providedat its lower end with a slot 94, and a rod 95 provided at its end with ascrew-threaded section 96 adapted to engage a cooperating screw-threadedaperture 97 in the arm 69 projecting downwardly from the lower side ofthe frame 65, provided with a reduced extension 98 received within theslot 94 of the arm 93, reciprocable through a suitable aperture in therear end plate 23 to permit reciprocation of the rear carbon assembly34, provided at its rear end with an operating mounted in the front andrear end plates 22 and 23,.prmjded' over its forward portion 104engaging within a vcooperatingly' 5 screw-threaded aperture 105 formedin an arm 106 extending downwardly and rearwardly from the base 50 ofthe front carbon holder assembly 33, directly operable-by means of ahandle 108 secured to an extension 109 projecting rearwardly of the rearend plate 23, and in'iposit-ively operable by means of an electric motor110 connected to the screw unit 100 by an intei'nte'diate shaft 111which is driven from the motor 110 by.

a worm 112 carried on the motor shaft 113 engaginga cooperating wormgear 114 carried onthe upper end of the intermediate shaft 111, andwhich drives through a worm 115 carried on the lower end oftheintermediate shaft 111 engaging afcooperating .worm gear 116rotatable on the extension 109 of the screw unit 100 but held infrictional engagement with the end of the righthand-screw section 104-of the screw unit 100 by means of a spring 117 compressed" between thehandle 108 and t-he outer face of the-rear end plate 23 and tending to'clamp the worm gear 116 between the righthand-screw 'portion 104 and aball-bearing unit 118 interposed between the worm gear 116 and the innerface of the rear end plate 23 to eliminate friction between the wormgear 116 and the rear end plate 23.

It will be understood by those skilled in the art that the handle108will ordinarilybe used in striking and adjusting the arc, and thatthereafter the motor 110 controlled in any suitable manner, will operatetomaintain the arc in. proper adjustment.

The reflector assembly 35 comprises a substantially square frame 119provided at one lowercorner with an ear 120 encircling the carrier rod31, and at the other lower corner with a fork 121 embracing the carrierrod 32, and provided intermediate its upper side 122 with a segmentalspherical recess 123 supporting a cooperating segmental sphere 124universally movable within the segmental spherical. recess 123, providedcentrally with an aperture 125 for the free passage of the rear carbon78, and carrying, by means of a spider 126, and fingers 127, a reflector128 provided with a central aperture 129 for the passage of the rearcarbon 7 8, held in position against the overhanging ends 130 of thefingers 127 by meansof a spring holding finger 131 secured to the spider126 engaging the rearface of the reflector 128 and acting to move thereflector 128 forward against the overhanging ends 130 of the fingers127, adapted in one position relative to the are between the front andrear carbons '57 and 7 8 to focus the light from the arc onto the lens39 carried in the aperture 38 of the nose 36, and adapted in'anotherpositlon relative to the arc to reflect the light from the arc asaparallel beam. illuminating the stereoptican projecting tapertures 43 ofthe nose 36. I a The segmental sphere 124 is held in position within thesegmental spherical recess 123, and the segmental sphere 124 and thereflector 128 are adjusted universally relative to the reflector frame119, by means of two separate andindependent adjusting means togethereffective to hold the seg- 'mental sphere 124 seated within thesegmental spherical recess 123, operating one to adjust the reflector128 about asubstantially vertical axis and the other to adjust thereflector 128 about a substantially horizontal axis, and the twoservingto provide conjointly'universal adjustment of the reflector 128 upon thereflector assembly frame 119. v

The mechanism for adjusting the reflector 128 about the substantiallyvertical axis comprises a tension spring 132 extending between the uppercorner 133 of the frame 119 and the adjacent arm 134 of the'spider 126,

and a rod 135 providedwith a screw-threaded section 136 engaging withina cooperatingly screw-threaded. aperture 137 formed in the upper corner138 of the frame 119, provided with a reduced extension 139 extendingthrough a slot 140 in the adjacent arm 141 of the spider 126. andterminating in a head 142 overlying the forward face of the spider arm141 adjacent the slot 140, reciprocable through a suitable' aperture inthe rear end frame 23 to permit adjusting reciprocation of the reflectorassembly 35,

operable by means of a handle 143 disposed rearwardly of the rear endplate 23, and eflective to draw the arm 141 of the'spider 126 toward theupper corner 138 of the frame 119 against the action of the tensionspring 132 to thus swing the reflector 128 about a substantiallyvertic'alaxis until it has assumed the desired lateral position; whilethe mechanism for adjusting the reflector 128 about the substantiallyhorizontal axis comprises a tension spring 144 extending between thelowest portion of the rim 145 of the spider 126 and the center of thelower cross bar 146 of'the frame 119, an arm 147 extending upwardly fromthe central por-- tion of the upper cross bar 122 of the frame 119, anda rod 148 provided with a screw threaded section 149 engaging within acooperatingly screw-threaded aperture 150 formed in the end of the arm147, provided with a reduced extension 151 extending through a slot 152in an arm 153 of the spider 126 andterminating in an-e-nlarged head 154overlying the inner face ofthe spider arm 153 adjacent the slot 152,reciprocable through a suitable aperture in the rear end plate 123 topermit adjusting reciprocation of the reflector 128, provided at itsrear end with an operating handle 155, and effective to draw the arm 153of the spider 126 toward the arm 147 of the frame 119 to thus swing thereflector 128 upwardly'against the action of the tension spring'le Auntil the reflector 128 has assumed the desired vertical position. 1 V

The reflector 128 is adjusted along the carrier rods 31 and 32 toproperly focus the light upon the lens 39 by means of a eon trol rod 156rotatably and reciprocably mounted inthe front and rear end plates 22and 23, provided with a screw-threaded extension 157 projectingforwardly of the front end plate 22, provided with a rear extension 158extending rearwardly of the rear end plate 23, provided adjacent theinner face of the rear end plate.23 with a collar 159 limiting therearward reciprocation of the control rod 156, provided on the end ofthe rearextension 158 with an operating handle 160, normally held inextreme rearward reciprocated osition by means of a spring 161encircling t erear extension 158 compressed between the operating.handle 160'and the outer face of the rear end plate 23 and effective tomaintain the collar 159 in tight engagement with the inner face of therear end plate 23, provided with a screw-threaded section 162 engaging acooperatingly screwthreaded aperture 163 in an arm 16 1 extendingdownwardly and rearwardly from the frame 119 of the reflector assembly35, and operable to adjust the reflector 128 by reciprocation of theframe 119 and reflector 128 produced by rotation of the control rod 156through the coaction of the screwthreaded section 162 of the rod 156 andthe cooperatingly screw-threaded aperture 163 in the arm 164 of thereflector assembly 35.

This adjustment of the reflector 128 provides the adjustment necessaryto focus the light beam upon the lens 39, and could provide theadjustment necessary to transform the light beam from a beam focused onthe lens- 39 for motion "picture projection to a parallel beam fallingon the apertures 43 and 44 for stereopticon projection. Such an arranement, however, would require not only pro onged effort to move thereflector 128 from its focusing beam position to its pgrallel beamposition but in addition care- 1 adjustment of the reflector 128 uponsuch movement'into either of these positions.

The embodiment of my invention herein shown provides means eliminatingthese difficulties, this means being herein shown as a roller 165rotatably mounted upon a bracket 166 depending from the lower. edge ofthe nose 36, swinging with the nose .36,

and efi'ective, when the nose 36 is moved into stereopticon projectingposition, as shown in Figures 2 and 7, to advance the reflector 128,from the beam focusing motion picture projecting position shown inFigures 1 and 6 and 15 to the parallel beam stereopticon projectinpositionshown in Figures 2 and 7 and 16, y reciprocation of the controlrod 156 against the action of the compressed spring 161 eflected byengagement of the roller 165 beneath a cone 167 provided with under theparticular projection conditions under which the lamp may be operating,and held in adjusted position by means of a lock screw 170 insertablewithin the screwthreaded aperture 168 of the cone 167 into binding andlocking engagement with the end of the extension 157 of the control 156.

It will of course be understood that upon retraction of the nose 36 intomotion picture projecting position the control rod 156 and the reflector128 will be returned by the spring 161 exactly to beam focusing motionpicture projection positionwithout further adjustment.

From the above description it will be obvious to those skilled in theart that I have provided a lamp for the projection of mo- At the sametime it also will I be obvious to those skilled in the art that theparticular embodiment of ,my invention herein shown and disclosedembodies advantages other than those particularly pointed out orsuggested herein, and also that; this particular embodiment of myinvention may be variously changed and modified without sacrificingthese advantages or departing from the spirit of my invention, and ittherefore will be understood that the disclosure herein is illustrativeonly, and that my invention is not limited thereto.

I claim:

1. Projection apparatus comprising: a housing; movablelight-beam-producing mechanism disposed within said housing, comprisinglight-producing means, comprising also movable reflector meanscooperating with said light-producing means to produce a light beam, andvariable by approach and recession of said reflector means toward andfrom said light-producing means to vary the focus of said 'light beam;movable nose mechanism connected to said housmg, provided with a pair ofopenings for the pasg sage of light therethrough, and movable be-- tweena position in which one of said openings is in operative relation 'tosaid lightv beam and a position in which the other of said openings isinoperative relation to said light beam; and means whereby sueh movementof said nose mechanism automatically efi'ects such movement of saidlight-beamproducin mechanism.

2. Pro ection apparatus compr1sm": a housing; and movablelight-beam-producing mechanism disposed within said housing, comprisinglight-producing means, comprising also reflector means cooperating withsaid light-producing means to produce a light beam, saidlight-producingmeans and said-reflector means being relatively movable toward and fromeach other, and'said light-beam-producing mechanism being variable byrelative approach and recession of said light-producing means and saidreflector means to vary the focus of said light beam between a beamsuitable for cinematographic projection and a beam suitable for) lightbeam, said light-producing means and said reflector means beingrelatively movable "toward'and from each other, and said light--beam-produc1ng mechamsm being variable by relativefapproach andrecession of said light-producing means and said reflector means to varythe vfocus of said light-beam between a beam suitable forcinematographic projection and a beam suitable for stereopticon'projection; and means to vary the relative position of said reflectormeans and said light-producing means by a fixed amount adjustable tocorrespond to projection conditions. v

4. Projection apparatus comprising: a housing; and movablelight-beam-producing mechanism disposed within said housing, comprisinglight-producing means, comprising also reflector means cooperating withsaid light-producing means to produce a light beam and movable towardand from said light-producing means, and variable by approach andrecession of said reflector means toward and from said 1i ht-producingmeans to vary the focus 0 said light beam between a beam suitable forcinematographic projection and a beam suitable for stereopticonprojection.

5. Projection apparatus comprising: a housing; movablellght-beam-producmg mechani snidisposed within said housing,

comprising light-producing means, comprismg also reflector meanscooperating with said light-producing means to produce a light beam andmovable toward and from said light-producing means, and variable byapproach and recession of said reflector means toward and from saidlight-producing means to vary the focus of said light beam' between abeam suitable for cinematographic projec tion and a beam suitable forstereopticon projection; and means'to effect a fixed movement of saidreflector meanslight beam, said light-producing means and 7 saidreflector means being relatively 'mov-' able toward and fromeach other,and saidlight-beam-producing means being variable by relative approachand recession of said light-producing means and said reflector means tovary the focus of said light beam between a beam. suitable forcinematograp'hic projection and a beam suitable for" stereopticonprojection; and movable nose mechanism connected to said housing,provided with a first opening for the passage of light therethrough forcinematographic projection and with a pair of openings for the passageof light there-' through for stereopticon projection, and

movable between a position in which said first opening is inoperativerelation to said light beam and a position in which said pair ofopenings are in operative relation to said'light beam. 7

7. Projection apparatus comprising: a housing; movablelight-beam-producing mechanism disposed within said housing,

comprising light-producing means, comprising also. reflector meanscooperatmg with said light-'produclng means to produce a light beam,said light-producing means and said reflector means being relativelymovable toward and fromeach other, and said hght-beam-producmg mechanismbeing variable by relative approach and recession ofsaid light-producingmeans and said reflector means to vary the focus of said light beambetween a beam suitable for cinematographic pro ection and a beamsuitable for stereoptlcon pro ectlon; movable nose mechanism[connectedtosaid housing, provlded with a first opening for the passage of lightthercthrough for cinematographic projection and With-a pair of-openingsfor the passage of light therethrough for stereopticon projection, andmovable between a 1 position in which said first opening is inoperativerelation to said light beam and a )osition iniwhich said pairof openings are in operative relation to said light beam; and

means for' effecting a fixed relative movement ofsaid light-producingmeans and said reflector means variable to correspond to projectionconditions.

8. Projection apparatus comprising: a housing; 7 movablelight-beam-producing mechanism disposed within said housing, comprisingli ht-producing means, comprising also re ector means cooperatin withsaid light-producing means to pro uce a lignt beam and movable towardand from i for stereoptico projection, and movable between a positi n inwhich said first open-m ing is in operative relation to said light beamand a position in which said pair of openings are in operative relationto said light beanf 9. Projection apparatus comprising: a: housing;movablev light-beam-producing mechanism disposed within said housing,

1 comprising light-producing means, comprising also reflector meanscooperating with said light-producing means to produce a light beamand'movable toward and from said light-producing means, and variable byapa proach and recession of said reflector meanstoward and from saidlight-producing means to vary the focus of said light beam between abeam suitable for cinematographic projection and a beam suitableforstereopticon projection; movable nose mechanism connected to saidhousing, provided with a first opening for the passage of lighttherethrough for cinematographic projection and with a pair of openingsfor the passage of light therethrough for stereopticon projection, andmovable between a position in which said first opening is in operativerelation to said light beam and a position in which said pair ofopenings are inoperative relation vto said light beam; and means forefiecting a fixed movement of said reflector 1 means variable tocorrespond to projection conditions.

10. Projection apparatus comprising: a

housing; movable light-beam-producing mechanism disposed within saidhousing,

comprising light-producing means, comprisriable b .ing also reflectormeans cooperatin in also reflector means cooperatin with saidlight-producing means to pro uce a light beam, and light-producing meansand said reflector means. being relatively movable toward and fromeachother, and said light-be'am-producing mechanism being varelativeapproach and recession 0 said light-producing means and said reflectormeans to vary the focus of said light beam; movable nose mechanismconnected to said housing, provided with a pair of openings for thepassage of light therethrough, and movable between a position in whichone of said openings is in operative relation to said light beam and aposition in which the. other of said openingsis in operative relation tosaid light beam;

and means whereby such movement "of one of said mechanisms willautomatically beaccompanied by such movement of the other of saidmechanisms.

11. Projection apparatus comprising: a

housing; movable mechanism disposed within said housing, comprisinglight-producing means, compriswith said light-producing means to pro ucea light beam and movable toward and from said light-producing means, andvariable by approach and recession of said reflector means toward andfrom said li ht-producing means to vary the focus 0 said light beam;movable nose mechanism connected to 1 said housing, provided with a pairofopen- ,ings for the'passage of light therethrough, and movable betweena position in which one of said openings is in operative relation tosaid light beam and a position in which the other of said openings is inoperative relation to said light beam; and means ,whereby such movementof one of said mechanisms will automatically be accompanied by suchmovement of the other of said mechanisms.

12. Projection apparatus comprising: a housing; inovablelight-beam-producing mechanism disposed within said housing,-

comprising light-producing means, comprisin also reflector meanscooperatin with said light-producing means to pro uce a light beam, saidlight-producing means and said reflector means being relatively movabletoward and from each other, and said lightbeam-producing mechanism beingvariable by relative approach and recession of said light-producingmeans and said reflector means to vary "the focus of saidlight beam;

light-beam-producing movable nose mechanism connected to said I housing,provided with a pair of openings for the passage of light therethrough,and

movable between a position in which one of said openings is in operativerelation .to said light beam and aposition in which the other of saidopeningsis in operative relation to said light beam; and means wherebysuch movement of one of said mechanisms automatic'ally effects suchmovement'of the other ing also reflector means cooperating withsaidlight-producing means to produce a light beam and movable toward andfrom said light-producing means, and variable by approach and recessionof said reflector means'toward and from said light-producing means tovary the focus of said light beam; movable nose mechanism connected tosaid housing, provided with a 'pair of openings for the passage ofvlight therethrough, and movable between a position in which one of saidopenings is in operative relation to said light beam and a position inwhich the other of said openings is in operative relation to said lightbeam; and means whereby such movement of one of said mechanismsautomatically effects such movement of the other of said mechanisms.

14. Projecting apparatus comprising: a housing; movablelight-beam-producing mechanism disposed within said housing,

comprising light-producing means, comprising also reflector meanscooperatiiig with said lIght-PIOdUCIIIg IIIBEIDS to produce a lightbeam, said light-producing means and said reflector means beingrelatively movable toward and from each other, and saidlight-beam-producing mechanism being variable by relative approach andrecession of said light-producing means and said reflector means to varythe focus of said light beam; movable nose mechanism connected to saidhousing, provided with a pair of openings for the passage of lighttherea through, and movable between a position in which one of saidopenings is in operative relation to said light beam and a position inwhich the other of said openings is in operative relation to said lightbeam; and means whereby such movement of said nose mechanismautomatically effects such movement of said light beam producingmechanisnr.

15. Projection apparatus comprising: a housing; movablelight-beam-producing mechanism disposed within said housing, comprisinglight-producing means, comprising also reflector means cooperating withsaid light-producing means to produce a light beam, said light-producingmeans and said reflector means being relatively movable toward and fromeach other, and said lightbeam-producing mechanism being variable byrelative approach and recession-of said light-producing means and saidreflector means to vary the focus of said light beam between a beamsuitable for cinematographic projecton and a beam suitableforstereopticon projection; movable nose vmechanism connected tols aidhousing, prov1ded with a first opening for the 'passage of lighttherethrough for cinematographic projection and with a second openingfor the passage of light therethrough forv stereopticon projection, andmovable between a position, in which one of said openings is inoperative relation to said light beam and a position in which the otherof said openings isin operative relation to said light beam; and meanswhereby such movement of one of the said mechanisms will automaticallybe accompanied by such movementof the other of said mechanisms.

'16, Projection apparatus comprising: a housing; movablelight-beam-producing mechanism disposed within said housing, comprisinglight-producing means, comprising also reflector means cooperating withsaid light-producing means to produce a through for cinematographicprojection and Y with a second opening for the passage of lighttherethrough for stereopt-icon projection, and movable between aposition in' which one of said openings is in operative relation to saidlight beam and a position in which the other of said openings is inoperative relation to said. light beam; and means whereby such movementof one of said mechanisms will automatically be accompanied bysuchmovement of the other ofsaid mechanisms.

17 Projection apparatus comprising: a

housing; movable light-beam-producing mechanism disposed within saidhousing, comprising light-producing means, comprising also reflectormeans cooperating with-said light-producing means to produce a lightbeam, said light-producing means and said reflector means beingrelatively movable toward and from each other, and saidlightbeam-producing mechanism being variable by relative approach andrecession of said light-producing means and said reflector means to varythe focus of said light beam between a beam suitable for-cinematograph--ic projection and a beam suitable for stereopticon projection; movablenose mechanism connected to said housing, provided with a first openingfor the passage of light therethrough for cinematographic PI'OjGC', tionand with a pair of openings for the passin which'said first opening isin operative' relation to said light beam and a position in which-saidpair of openings are inoperative relation to said light beam; and meansI v whereby such movement of one of said mechanisms will automaticallybe accompanied by such movement of the other of said mech anisms;

18. Projection apparatus comprising: a

" housing; movable light-beam-producing mechanism disposed within saidhousing,- comprising light-producing means, comprising also reflector,means cooperatin with said light-producing means to pro uce a lightbeamand movable toward and from said light-producing means, and variable byapproach and recession of said reflector means toward and from saidlight-producing means to vary the focus of said light 1 beam between abeam suitable for cinematographic projection and a beam suitable forstereopticon projection; movable nose mech-, anism connected to saidhousing, provided with a first opening for the passage of lighttherethrough for cinematographic pro ection and with a pair of openingsfor'the ,passage of light therethrough for stereopticon projection, andmovable between a position in which said first opening is in Opera tiverelation to said light beam and a position in which saidpair of openingsare in operative relation to said light beam; and means whereby suchmovement of one of said mechanisms will automatically be accompanied bysuch movem nt of the other .of said mechanisms.

19. Projection apparat fmprising: a'

housing; and lightbeam producing. mechanism disposed within saidh'ousijng and in= I 40 eluding light-producing'me'ans and reflectormeans cooperating with said light-producil-ig means to produce a lightbeam suitablefor cinematographic projection, said reflector means beingso mounted as to permit operative positioning of at least a part thereofto vary said 'light-beam-prOducing means to produce a light beam ofdifferent focus and suitable for stereopticon projection.

20. Projection apparatus comprising: a

i housing, and light-beam-p'roducing mechamsm disposed within saidhousing and ineluding light-producing means and reflector" meanscooperating with said light-producing means to produce a light beamsuitable for cinematographic projection, said light-pro ducing means andsaid reflector means being so mountedas to permit operative relativepositioning thereof to vary said light-beamproducing means to produce alight beam 50 of diflerent focus and suitable for stereopticonprojection.

In testimony whereof I hereunto affixmy signature. I HARRY H; STRONG.

